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| //===-- X86MCAsmInfo.cpp - X86 asm properties -----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the declarations of the X86MCAsmInfo properties.
//
//===----------------------------------------------------------------------===//
#include "X86MCAsmInfo.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
enum AsmWriterFlavorTy {
// Note: This numbering has to match the GCC assembler dialects for inline
// asm alternatives to work right.
ATT = 0, Intel = 1
};
static cl::opt<AsmWriterFlavorTy> AsmWriterFlavor(
"x86-asm-syntax", cl::init(ATT), cl::Hidden,
cl::desc("Choose style of code to emit from X86 backend:"),
cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
clEnumValN(Intel, "intel", "Emit Intel-style assembly")));
static cl::opt<bool>
MarkedJTDataRegions("mark-data-regions", cl::init(true),
cl::desc("Mark code section jump table data regions."),
cl::Hidden);
void X86MCAsmInfoDarwin::anchor() { }
X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &T) {
bool is64Bit = T.getArch() == Triple::x86_64;
if (is64Bit)
CodePointerSize = CalleeSaveStackSlotSize = 8;
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
if (!is64Bit)
Data64bitsDirective = nullptr; // we can't emit a 64-bit unit
// Use ## as a comment string so that .s files generated by llvm can go
// through the GCC preprocessor without causing an error. This is needed
// because "clang foo.s" runs the C preprocessor, which is usually reserved
// for .S files on other systems. Perhaps this is because the file system
// wasn't always case preserving or something.
CommentString = "##";
SupportsDebugInformation = true;
UseDataRegionDirectives = MarkedJTDataRegions;
// Exceptions handling
ExceptionsType = ExceptionHandling::DwarfCFI;
// old assembler lacks some directives
// FIXME: this should really be a check on the assembler characteristics
// rather than OS version
if (T.isMacOSX() && T.isMacOSXVersionLT(10, 6))
HasWeakDefCanBeHiddenDirective = false;
// Assume ld64 is new enough that the abs-ified FDE relocs may be used
// (actually, must, since otherwise the non-extern relocations we produce
// overwhelm ld64's tiny little mind and it fails).
DwarfFDESymbolsUseAbsDiff = true;
UseIntegratedAssembler = true;
}
X86_64MCAsmInfoDarwin::X86_64MCAsmInfoDarwin(const Triple &Triple)
: X86MCAsmInfoDarwin(Triple) {
}
void X86ELFMCAsmInfo::anchor() { }
X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
bool is64Bit = T.getArch() == Triple::x86_64;
bool isX32 = T.getEnvironment() == Triple::GNUX32;
// For ELF, x86-64 pointer size depends on the ABI.
// For x86-64 without the x32 ABI, pointer size is 8. For x86 and for x86-64
// with the x32 ABI, pointer size remains the default 4.
CodePointerSize = (is64Bit && !isX32) ? 8 : 4;
// OTOH, stack slot size is always 8 for x86-64, even with the x32 ABI.
CalleeSaveStackSlotSize = is64Bit ? 8 : 4;
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
// Debug Information
SupportsDebugInformation = true;
// Exceptions handling
ExceptionsType = ExceptionHandling::DwarfCFI;
// Always enable the integrated assembler by default.
// Clang also enabled it when the OS is Solaris but that is redundant here.
UseIntegratedAssembler = true;
}
const MCExpr *
X86_64MCAsmInfoDarwin::getExprForPersonalitySymbol(const MCSymbol *Sym,
unsigned Encoding,
MCStreamer &Streamer) const {
MCContext &Context = Streamer.getContext();
const MCExpr *Res =
MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Context);
const MCExpr *Four = MCConstantExpr::create(4, Context);
return MCBinaryExpr::createAdd(Res, Four, Context);
}
void X86MCAsmInfoMicrosoft::anchor() { }
X86MCAsmInfoMicrosoft::X86MCAsmInfoMicrosoft(const Triple &Triple) {
if (Triple.getArch() == Triple::x86_64) {
PrivateGlobalPrefix = ".L";
PrivateLabelPrefix = ".L";
CodePointerSize = 8;
WinEHEncodingType = WinEH::EncodingType::Itanium;
} else {
// 32-bit X86 doesn't use CFI, so this isn't a real encoding type. It's just
// a place holder that the Windows EHStreamer looks for to suppress CFI
// output. In particular, usesWindowsCFI() returns false.
WinEHEncodingType = WinEH::EncodingType::X86;
}
ExceptionsType = ExceptionHandling::WinEH;
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
AllowAtInName = true;
UseIntegratedAssembler = true;
}
void X86MCAsmInfoGNUCOFF::anchor() { }
X86MCAsmInfoGNUCOFF::X86MCAsmInfoGNUCOFF(const Triple &Triple) {
assert(Triple.isOSWindows() && "Windows is the only supported COFF target");
if (Triple.getArch() == Triple::x86_64) {
PrivateGlobalPrefix = ".L";
PrivateLabelPrefix = ".L";
CodePointerSize = 8;
WinEHEncodingType = WinEH::EncodingType::Itanium;
ExceptionsType = ExceptionHandling::WinEH;
} else {
ExceptionsType = ExceptionHandling::DwarfCFI;
}
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
AllowAtInName = true;
UseIntegratedAssembler = true;
}
|